Leading-in conductor



Nov. 5,-1929. G, HoLs-r E1' AL 'LEADING-IN CONDUCTOR 'Filed may 14, 192sz-sneetssneet '1- ...llrfury//Jifl/ j of the patented Nov. 5, 1929UNITED sTATl-:s

-Parietti, orificlzjx GILLES HoLsT, .uN EEEGMANS, AND CORNELIS Bor., orEINDHOVEN, THE NETHER- LANDs, AssIGNons rro NmurnoosE vENNoo'rscinirArnrnrrs GLoEmAnrEN- EADEIEKEN, or EINDHOVEN, THE NETHERLANDS LEADING-INCONDUCTOR Appuenuon many 14, 192s, serial No. 638,931, ami in the'Netherlands nay 27, l1922.

The present invention relates to leading-inl conductors and moreparticularly to electric conductors which are hermetically sealed in lcially suitable for conducting relatively heavy electric currents.

According to the present invention a `disc is fused into the glassvessel, which' disc con sists of a metallic material which on fusing indoes not generate gases and has a coeiicientof expansion which is littledifferent from that of the vitreous material into which it is to besealed, a conductor being tixed to said disc. v The invention isespecial-ly adapted for use in connection with discs composed of ametallic'material which will be vwetv by -the` rsurrounding vitreousmaterial. Still more particularly the invention is adapted for usl ingchrome-iron of such composition that its coefficient of expansiondiffers little from that glass. f

In the case that the vessel partly consists of a `tubular member ofvitreous material, the disc is preferably fused into the wall of saidtubular member at a short distance from its end.

The leading-in conductors `may be led through the discs but preferablythey4 are fixed on each side of the discs. In the case the discsconsistof chrome-iron itis desirable to choose nickel for the portions of theconductors fused to the discs.

According to another featureof the inven- 40 tion a plurality of. discsis hermetically connected together along at least a portion of theircircumferences by meansU of a layerI of vitreous material, therebyforming a disc of larger dimensions, said disc being fused into thevitreous wall ofthe vessel at` its circumference and a conductor beingfixed to each of the discs.4

The discsare preferably sector-sha ed so that `they form togetheracircular isc of larger dimension The present invention relates also to ay.method for sealing in the discs into a wall of vitreous material. Thismethod is characterized in first applying a thin layer of vitreousmaterial around the circumference of said disc and then sealing the discwith -saidglass layer into the wall of' vitreous material.

In the accompanying drawing some embodiments of the invention arediagrammatically` illustrated. y

Figure l shows a leading-in conductor having the features accordingtothe present in,

vention with a surrounding glass tube.,

In Figure 2 an arrangement according to the invention applied to anelectric arc lamp provided with tungsten electrodes 'is illustrated.v

-In Figure 3 is shown a lamp provided with two leading-in Wires, whichhave been hermetically sealed. l v` e Figure 4 shows the top-view of thestem inl a lamp according-to Figure 3, the ,polewires, having been cutat a short distance above the stem. n -f` Figure 5 shows a top-view ofan arrangement with four leading-in wires, and

Figure 6 shows a lamp in which the discs Y are fused directly into the,neck of thebulb.

Figure 1 shows a glass tube l, a disc2 and leading-in wires 3 and 4. Theleadiiigin wires may be constructed of any `suitable material o goodconductivity, e.l g. of copper..

are obtained with chrome-iron offa suitable composition.

The inventors have also recognized thatv the discs need not be verythin.. When using chrome-iron, discs of 1-2 millimeters thickness may befused in without -any inconvenience, which has not been thought possiblehitherto.

The composition depends on the nature of up to. are allowable. ln aparticular v case, in which, the coe'icient of expansion of thechrome-iron was about 10% higher than that of the glass, the results'were nevertheless quite favourable. llt will be clear how- Jever thatthe smaller the diderence between the coeficients of expansion, thebetter is the result obtained.,

MThe leading-in wires may be Xed to the dises in various ways.. Theymaybe le'd through the discs and xed to the discs by soldering, welding orin any other way. However, in doing so there is a risk of formv ingair-leaks at the place ofintroduction and it is therefore preferable tofix the leading-in wires at both sides to the. discs for instance bysoldering or weldin If chrome-iron discs are used, it is pre rable toconstruct the portions, fixed to the discs, of nickel. For this metalwelding is a good and easy way of iXing the same to chrome-iron.

Referring again to Figure 1, one of the leading-in wires (3) whichserves to X the electrodes or the incandescent body, maybe stiff andpreferably consists wholly or at least as to the portion xed to the isc,of nickel. The other leading-in wire (4) is preferably made flexible andmay consist ofv twisted copper wire.

As it is rather difficult however to ix copper to chrome-iron, it ispreferable to first apply a nickel current-leadalso at this side of thedisc and to fix the copper wire thereto, e. g. by soldering.

En Figure 2 an electric arc-lamp with tungn sten electrodes is shown,provided with leading-in conductors.

The glass bulb 6 contains the glass/stem which ends in the tubes 8 and9, into which the discs 10 and 11 are fused. The discs support on oneside conductors 12 and 13 with the tungsten electrodes and on the otherside the leading-in wires 1d and 15.`

The lamp shown in Figures 3 and 4 has a bulb 16, into which the stem 17is fused. Two crescent-shaped discs 18 and 19 are fused into this stem17 whilst leading-in 'Wires 20, 21, 22 and 23 are fixed on each side ofthe discs.

The dises may be shaped into any form desired. Preferably care should betaken that the discs can be fused together with a relav tively narrowglass layer between them, whilst the free part of the circumference ofat least one of the discs is then fused into the wall of the glassvessel.` One or more discs may also be connected with the other disc(discs) along the whole of their circumference. For instance a circularand an annular discq can be connected by means of an intermediateannular glass layer, and then the external circumference of the annulardisc, with the glass wall can be fused together.

Although it is not necessary, 4'the most simple course is to use flatdiscs, which are fused together into one larger flat disc..

Furthermore the shape of the discs depends on the shape of the glassvessel at the place of fusing. lf several wires are fused into a tubularpart with'circular section, the most simple shape for the discs is thesectorl of a circle, whereas in the case of two leadu ing-in wires thecrescent shape is more convenient.

ln some cases it may be desirable to introu Referring to Figure 3thepole wires 20 and 21 supporting the incandescent iilament consistpreferably of nickel, whilst also the Wire-portions 22 and 23 are ofnickel. The

flexible wires 31 and 32, which consist of copper, may be fixed to thenickel by l'soldering or welding. p

When manufacturing the device, the discs are preferably first connectedtogether by a glass layer and then the aggregate obtained is fused intothe glass wall for example into a tube.

The fusing is assisted by first surrounding the external circumferenceof the discs by a thin glass layer.

Figure 6 represents an embodiment of the invention in which the discs,with the leading-in wires fixed to them, are directly fused to the neck29 of the bulb 30.

This is the most simple emebodiment of the invention. l/Vhenconstructing the device according to Fig. 3 there is one step more to beperformed than in the case with the device shown in Figure 6 viz, thefusing of the stem into the bulb.

The present invention may be applied to electric glow lamps and allkinds of discharge tubes such as rectitiers, generating tubes orreceiving tubes, gasfilled glowlamps, vapour lamps or the like. It isparticularly advantageous in cases where no good results can be obtainedwith leading-in wires of platinum, nickel-iron or nickel-iron withcopper-coating, as generally used; particularly in the case of heavycurrents of e. g. more than amperes.

, What we claim is :l

l. The `combination of a vessel having at least a portion of its Wallconsisting of a vitreous material, a disc consisting of chromeironhaving a coefficient of expansion which is little different from that ofthe said vitreous material, said disc being hermetically fused at itscircumference into said vitreous Wall and forming a part thereof, andtwo conductors fixed each to one side of said disc and consisting ofnickel at those portions which are fixed to the chrome-iron disc.

2. The combination of a vessel having at least a portion of its Wallconsisting of vitreous material, a plurality of dises consisting of ametallic material which on fusing-indoes not generate gases and thecoefficient of expansion of Which is little different from that of saidvitreous material, saiddiscs being hermetically connected together alongat `least a portion of their circumferences by means of a layer ofvitreous material,

- thereby forming together a disc of larger dimensions, said disc oflargerdimensions being fused into said vitreous vvall of said vessel andconductors fixed to said discs.

3. The combination of a vessel partly con-v sisting of a tubular memberof vitreous material, a plurality of discs consisting of a metallicmaterial Whichon fusing-in does not "generate gases and `thevcoeflic1entof expansion of which is little different from that of said vitreousmaterial, said discs being her- -metically connected together along atleast a portion of their circumference. by means of a layer of vitreousmaterial, thereby forming together avdisc of larger dimensions, saiddisc of larger dimensions being fused into the Wall of said tubularmember at a short distance of the end and conductors fixed to saiddiscs. v

4. The combination of a vessel having at least a portion of its Wallconsisting of vitreous material a plurality of sector-shaped Adiscsconsisting of a metallic material which on fusing-in does not generategases and the coefficient of, expansion of Which is little differentfrom that of the vitreous material said discs being hermeticallyconnected .t0- gether along a portion of'their circumference by meansofa layer of vitreous material thereby forming a disc of largerdimensions,

l. said latter disc being hermetically sealed at layer of. vitreousmaterial, thereby forming together a disc of larger dimensions, saiddisc of larger dimensions being fused into said vitreous Wall of saidvessel, and conduetors fixed to said dises.

6. The combination of a vessel having at least a portion of its Wallconsisting of vitre-` ous material a plurality of discs consisting ofchrome-iron containing more than 10% 75v and less than 50% of chromium,said discs being hermetically connected together along at least aportion of their circumference by means of a layer of vitreous material,thereby forming together a disc of larger dimen- 8'0 sions, said disc oflarger dimensions being fused into said vitreous Wall of said vessel andconductors fixed to said discs.

7 The combination of a vessel having at' least a portion of its Wallconsisting of Vitre- 85 ous material a plurality of discs consisting ofchrome-iron having a coefficient of eX- pansion which differs littlelfrom that of said vitreous material, said discs being hermeticallyconnected together along atleast a portion of their circumference bymeans of a layer of vitreous material, thereby formin together a disc oflarger dimensionssai dise of larger dimensions being fused .into i saidvitreous Wall of said vessel, and conductors fixed to each side of saiddiscs' and consisting of nickel at those portions which are connected tosaid chrome-iron dises.-

In testimony whereof Wel affix our signa-.

tures. l

` 'Dm GILLES HULST.

JAN BERGrlSIAN-S.v CORNELIS BOL.

